Hey mate,
Pls tell me this will be updated to 2.1

Not quite. Some changes make launching impossible. But after some time, a version of Rampant for 2.1 will be released

Work is currently underway on a major update to Rampant for Factorio 2.0. Approximate time is unknown.
After that, work will begin for 2.1 compatibility
If 2.1 is released earlier, the mod will be incompatible with it for some time

Any update on this? Do you develop on github?

Development is almost complete.
I didn't have time to finish the game with the flight to the destroyed planet, but everything seems to be working
Final tweaks are being made, and the release will likely be next week

I don't use github, my computer's capabilities are enough for me

I've been playing on the 2.1 branch and have noticed that rampent expansions don't trigger the new "enemy expansion" alert. Could that be added?

This feature was added quite recently.
If the developers don't remove this notification within some time, I'll do the same for the Rampant settlement emulation.

I need to keep an eye on it, because until recently there were critical bugs in the standard settlement algorithms and the developers may continue to fix them